Disazo dye.



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AUGUST LEOPOLD LASKA, 0F OFFENBAGH-ON-THE-MAIN, GERMANY, ASSIGNOR T0 CORPORATION CHEMISCHE FABRIK GBIESHEIM-ELEKTBON, OF FRANKFORT-ON- rnnnurn, GERMANY.

DISAZO DYE.

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No Drawing.

Specification of Letters Patent.

Patented July 19, 1919.

Application filed April 13, 1910. Serial No. 555,285.

Offenbach-on-the-Main, in the Grand Duchy of Hesse, Germany, (with the post-ofiice address .Gerberstrasse 5,) have invented new and useful Improvements in Disazo Dyestuffs, of which the following is'a' specification.

My invention relates to the production of disazo dyestufis especiall suited for the preparation of pigment c0 ors.

The process consists in, combining the tetrazo composed of dichlorodiaminodiphenolalkylethers having the formula:

01 wherein X means an alkyl group with naphthol derivatives of the general constitution lution, which if necessary may be filtered, is

introduced into an ice cold solution of 3 6 parts of 2 naphthol 3 6 disulfonic acid (d1- sodium salt). The mixture is kept alkaline by addition of sodium carbonate until the combination is complete. The temperature is then raised to 70 and the dyestuif precipitated by addition of common salt, filtered off and dried. It forms a black-brown powder, dissolving in concentrated sulfuric acid with blue, in water with violet color. By its reduction With stannous chlorid and hydrochloric acid dichlorodianisidin and aminonaphtholdisulfonic acid are obtained. The dyestuif produces clear reddish-violet color lakes.

Example H: 15.6 parts of dichlorodianisi'din are diazo'tized in the aforesaid manner. The resulting tetrazo solution, which if necessary may be filtered, is poured into a solution of 35 parts of l naphthol 3 :8 disulfonic acid (acid sodium salt), which is kept alkaline by, addition of soda during the combination process. The temperature is then raised to 70, the dyestufl precipitated by addition of common salt, filtered oil and;

dried. It forms a black-brown powder dissolving in concentrated sulfuric acid with blue, in water with b1uish-red color. By its reduction with stannous chlorid and hydrochloric acid dichlorodianisidin and aminonaphtholdisulfonic acid are obtained. The dyestuff produces clear violet color lakes.

The dyestuif obtained from two molecules of 1 naphthol 3:6 disulfonic acid produces bluish-red to bordeaux-red pigment colors.

The analogous combinations with 1 acetylamino 8 na hthol-3 :6 disulfonic acid respectively with l benzoylamino 8 na hthol 3:6 disulfonic acid produce red-vio et re spectively blue-violet color lakes.

The dyestuff from dichlorodiani'sidin and l chloro 8 naphthol 3:6 disulfonicacid can be transformed in violet color lakes.

In analogous manner may be performed the combinations with naphtholmonosul- 'fonic acids, for instance with 1:31:4-1:5

-2 :62 :7 naphtholsulfonic acid.

N 0W What I claim and desire to secure by Letters Patent is the following:

1. The process for the production of disazo coloring matter, especially suited for the preparation of pigment'colors, consist- 'ing in combinin the tetrazo compound of dichlorodiamin iphenolalkylethers of the aforesaid constitution with naphthol deriva'tives of the general formula:

wherein X means a hydrogen atom, a chlorin atom and an acidylamino group, and Y a hydrogen atom and a sulfon c group.

2. As new articles the dyestuffs which can be obtained by combining the tetrazo com-- pound of dichlorodiaminodiphenolalkylethers, of. the aforesaid constitution with naphthol derivatives of the general formula:

c H;oH.so,H.X.Y wherein X means a hydrogen atom, a chlorin atom and an acidylamino-group, and Y a hydrogen atom and a sulfonic group, which dyestuffs dissolve in water in form of their alkali salts with bluish-red to viole'tred color, in concentrated sulfuric acid with blue color, which yield dichlorodiaminodiphenolalkylethers and aminonaphthol derivatives by reduction with stannous chlorid and hydrochloric acid, and which can be I transformed into bluish-red to blue violet pigment colors.

3. The process for the production of disazo coloring matter, especially suited for the pre aration of pigment colors, consisting in com ining the tetr'azo compound of dichlorodianisidin of the aforesaid constitution with naphthol derivatives of the general formula: o n onso nxv wherein X means a hydrogen atom, a chlorinatom and an acidylamino group, and Y a hydrogen atom and a sulfonic group.

4:. As new articles, the dyestuffs which can be obtained by combinin the tetrazo compound of dichlorodianisidin of the aforesaid constitution with naphthol derivatives of the general formula:

wherein X may be a h dregen atom, a chlorin atom and an acidy amino roup, and Y a hydrogen atom and a su fonic group which dyestuffs dissolve in water in form of their alkali salts with bluish-red to viole'tred, in concentrated sulfuric acid with blue 

